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Erosion of N = 20 shell in $^{33}$Al investigated through the ground-state electric quadrupole moment
- Source :
- Physics Letters B, Physics Letters B, Elsevier, 2012, 714, pp.246--250. ⟨10.1016/j.physletb.2012.07.030⟩, Physics Letters B, 2012, 714, pp.246--250. ⟨10.1016/j.physletb.2012.07.030⟩
- Publication Year :
- 2012
- Publisher :
- HAL CCSD, 2012.
-
Abstract
- Expérience GANIL/LISE; Electric quadrupole moment Q of the 33Al ground state has been measured by means of β-NMR spectroscopy using a spin-polarized 33Al beam produced in a projectile fragmentation reaction. The obtained Q moment, |Qexp(33Al)| = 132(16) emb, shows a significant excess from the prediction of shell model calculations within the sd shell. The result indicates sizable admixing of pf intruder configurations in the ground state, demonstrating that the N = 20 shell closure certainly erodes in 33Al, a nucleus located on the border of the island of inversion. Comparison was made with predictions of the Monte Carlo shell model, and also a particle-vibration coupling model treating the neutron pairing correlations in the ground state of 33Al. Again, a significant admixture of pf intruder configurations to the 33Al ground state was needed in both theoretical approaches to explain the observed large Q .
Details
- Language :
- English
- ISSN :
- 03702693
- Database :
- OpenAIRE
- Journal :
- Physics Letters B, Physics Letters B, Elsevier, 2012, 714, pp.246--250. ⟨10.1016/j.physletb.2012.07.030⟩, Physics Letters B, 2012, 714, pp.246--250. ⟨10.1016/j.physletb.2012.07.030⟩
- Accession number :
- edsair.dedup.wf.001..bfc3eb9b24a9bbaaf2131a42e56fad6a
- Full Text :
- https://doi.org/10.1016/j.physletb.2012.07.030⟩